Cracked Exhaust Runner usable?
#1
Newbie
Thread Starter
Cracked Exhaust Runner usable?
So I'm installing a new MHI turbo in my X and when I removed the exhaust manifold I found a small crack on the inside of the collector between the runners. How dicked is it?
I'd really like to get my car back together, the MAP cast exhaust manifold is back ordered for weeks and tubular headers are both significantly more expensive and not what I want on my daily driver.
Am I risking much by just continuing to use the cracked manifold until I can get it replaced properly later this summer?
This isn't my header but this is an extremely similar crack:
So, worth risking it or do I pull out the stops to get a replacement? (likely tubular)
I'd really like to get my car back together, the MAP cast exhaust manifold is back ordered for weeks and tubular headers are both significantly more expensive and not what I want on my daily driver.
Am I risking much by just continuing to use the cracked manifold until I can get it replaced properly later this summer?
This isn't my header but this is an extremely similar crack:
So, worth risking it or do I pull out the stops to get a replacement? (likely tubular)
Last edited by KVandy15; Feb 29, 2016 at 09:47 AM.
#2
Evolved Member
iTrader: (36)
So I'm installing a new MHI turbo in my X and when I removed the exhaust manifold I found a small crack on the inside of the collector between the runners. How dicked is it?
I'd really like to get my car back together, the MAP cast exhaust manifold is back ordered for weeks and tubular headers are both significantly more expensive and not what I want on my daily driver.
Am I risking much by just continuing to use the cracked manifold until I can get it replaced properly later this summer?
This isn't my header but this is an extremely similar crack:
So, worth risking it or do I pull out the stops to get a replacement? (likely tubular)
I'd really like to get my car back together, the MAP cast exhaust manifold is back ordered for weeks and tubular headers are both significantly more expensive and not what I want on my daily driver.
Am I risking much by just continuing to use the cracked manifold until I can get it replaced properly later this summer?
This isn't my header but this is an extremely similar crack:
So, worth risking it or do I pull out the stops to get a replacement? (likely tubular)
#5
Newbie
Thread Starter
So I lied, I couldn't bring myself to install the cracked manifold and I didn't want to wait weeks to get an investment cast manifold so say hello to my new friend...
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KVandy15 (Mar 7, 2016)
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#8
EvoM Guru
iTrader: (1)
That tubular mani will crack eventually too..
#11
Newbie
Thread Starter
Oh I know, but it's not already cracked so big improvement from where I was. The part also comes with a lifetime warranty so when it does I'll have some recourse.
#12
Newbie
Thread Starter
Homebrewed, I took some queues from the shield map includes in the T3 hotparts kit but that one leaves some small parts of the valve cover exposed and is designed to be used with an aluminum valve cover. I needed a more robust solution for the plastic valve cover so I rolled my own.
#13
Evolved Member
How long a tubular lasts is totally hit or miss and also dependant on the MFG. For track use, i wouldn't use MAP tubular mani. For street use, its as good as anything else that doesn't come with a lifetime warranty. It's hard to beat full race simply due to their lifetime warranty. A handfull of other companies offer warranties as well with their tubular mani's.... but FR has been doing it for like 20 years, so they've got this whole production tubular manifold thing down to a science.
FWIW, cracks in your stock manifold are fine. They might leak when the manifold is cold, but as soon as it heats up the cracks seal. I have cracks in mine and i track the **** out of it. No evidence of exhaust leaks from the mani just from inspecting the inside of the heat shield. Usually a leak will show up as carbon deposits on the shield or it'll straight burn through if the leak is bad enough. The inside of my shield is clean.
FWIW, cracks in your stock manifold are fine. They might leak when the manifold is cold, but as soon as it heats up the cracks seal. I have cracks in mine and i track the **** out of it. No evidence of exhaust leaks from the mani just from inspecting the inside of the heat shield. Usually a leak will show up as carbon deposits on the shield or it'll straight burn through if the leak is bad enough. The inside of my shield is clean.
#14
EvoM Guru
iTrader: (1)
How long a tubular lasts is totally hit or miss and also dependant on the MFG. For track use, i wouldn't use MAP tubular mani. For street use, its as good as anything else that doesn't come with a lifetime warranty. It's hard to beat full race simply due to their lifetime warranty. A handfull of other companies offer warranties as well with their tubular mani's.... but FR has been doing it for like 20 years, so they've got this whole production tubular manifold thing down to a science.
FWIW, cracks in your stock manifold are fine. They might leak when the manifold is cold, but as soon as it heats up the cracks seal. I have cracks in mine and i track the **** out of it. No evidence of exhaust leaks from the mani just from inspecting the inside of the heat shield. Usually a leak will show up as carbon deposits on the shield or it'll straight burn through if the leak is bad enough. The inside of my shield is clean.
FWIW, cracks in your stock manifold are fine. They might leak when the manifold is cold, but as soon as it heats up the cracks seal. I have cracks in mine and i track the **** out of it. No evidence of exhaust leaks from the mani just from inspecting the inside of the heat shield. Usually a leak will show up as carbon deposits on the shield or it'll straight burn through if the leak is bad enough. The inside of my shield is clean.
The cracks in your mani may seal now. But you're asking for a problem when one of those crack blows out on track and your car catches on fire...
#15
Newbie
Thread Starter
How long a tubular lasts is totally hit or miss and also dependant on the MFG. For track use, i wouldn't use MAP tubular mani. For street use, its as good as anything else that doesn't come with a lifetime warranty. It's hard to beat full race simply due to their lifetime warranty. A handfull of other companies offer warranties as well with their tubular mani's.... but FR has been doing it for like 20 years, so they've got this whole production tubular manifold thing down to a science.
FWIW, cracks in your stock manifold are fine. They might leak when the manifold is cold, but as soon as it heats up the cracks seal. I have cracks in mine and i track the **** out of it. No evidence of exhaust leaks from the mani just from inspecting the inside of the heat shield. Usually a leak will show up as carbon deposits on the shield or it'll straight burn through if the leak is bad enough. The inside of my shield is clean.
FWIW, cracks in your stock manifold are fine. They might leak when the manifold is cold, but as soon as it heats up the cracks seal. I have cracks in mine and i track the **** out of it. No evidence of exhaust leaks from the mani just from inspecting the inside of the heat shield. Usually a leak will show up as carbon deposits on the shield or it'll straight burn through if the leak is bad enough. The inside of my shield is clean.
I wouldn't have worried about the cracks if I wasn't bolting a brand new MHI 18K turbo to the other end of it, what little risk there might have been it still just wasn't worth it to me to compromise on the manifold with the amount of money I already had into the repair.
The inside of my shield was the exact opposite of clean, this had little to do with the manifold and much to do with this: